give a doseing of penatrateing oil.wiggle oil agaig let sit for a few hours.
oil again and wiggle some more.keep doing it untill it frees up. A little tapping with a small hammer will help too. Just don't hit it real hard
because you could break the manifold. Good luck and persistance will help too.
--------------------
37 Chevy 1/2 Ton


37 Chevy 1/2 Ton
86 Chevy Blazer
98 Drudge 24 valve Cummins
One worn out Timberjack